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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62deab533b7395f15ec9ac86ee6d4063bbeebf4913cf83e4b2c1649aa190831d' 
  AND token = 'Ju8oJb6m2xJWC2XMDqz68xBxLA5Zxq4Fv1NGOuEs7gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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