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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f72dbc0e35c9a5c7c3b05e08904e8108bf6e6fb3ad0b666e03a6cc9a734962' 
  AND token = 'HL61SaO8LGjddYvXMLWYAtkjBj3RlIPFjTkZP6dKNUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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