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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0199416cf7be4ba4baecf50ccb6cf5b30a833e12f5077a2aaf85c6ee9447982a' 
  AND token = 'PwNt2tArcGpDIvRJexZnwhhJ9Rdf46b2GhF0uJOJxCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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