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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae1003cc8a70d3483f1fa917aaa4791948a2008fd4f786395a07a8b59cfcd6e' 
  AND token = 'W0FoxBeh1yBueG1R2F+ZzRHiHliF/mXcyIKud4JJ+XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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