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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21e0fa3a8167ceab800aadea4937df4dc4a9acbec40c0c50ad965f0069571d7' 
  AND token = '19ifwp+qjYAy6gRbOy7J3blsmd1Pgou7skkPS91nB5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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