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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6049f8b5171e053909e12fc593665792b83c3a31d0d48083147f2e097802050b' 
  AND token = 'xaxIB3R5gn3UI0rqfPwCdFt4M6PjCzbUil7etMddHu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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