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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a579d890db410630c228bdc89983a60278633a8cf01c0f823e6f4e78fa416923' 
  AND token = 'T/8uTWq40WSMYlb5DwnWjKT+4R59wMHvlfmyfJj9thw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}