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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2527b0aaf15c26e0bc51f23d78fe4bc86a419df7c7016b1019fd3e930c6c03f' 
  AND token = 'vQ9yNbKhyXDbJyLL7uZJ9wcJwAWyS4P0mfD4T3+qgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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