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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494f2dece5bd7e188c626c2d3195debf45aeebb2c8ca5f9b8255c7bc68143425' 
  AND token = 'oyBE+rJRacQEqJU9/fcM0hySjDXIY+RKy31vEo3jZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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