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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b5124322c74b46fe04fb93ffc08452d5976146f9d73458739b6ad964d19a04' 
  AND token = 'c3bJ5ncMwXr/M2xXNLCt5DO7Vv5zWdk9m9gcH9eM3oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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