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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecedaa410aebb77f2dd7bac0ef6c7e50c95ee19f8e81567048c8add4b4a69ac2' 
  AND token = 'XUEClqlYRvU6F3T5LgYa8ZtnT89XW0Gx43OIl7RrtOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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