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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9308ea6ab04593f414cc257230cc1ff42a3441d99e6f1ebf36e9d85c27d736' 
  AND token = 'WiscfFZ52qL9i+Oo3X9tZJdF+G7/aQc6W8VNdFh8ymk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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