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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa1f6e28a47930b8fe004a3a7c86ef2aaa8416e436fe67ea277065b7b1b31e3' 
  AND token = 'YKkct6nFpJFsjzNB9Ukv7YNfLBpdNu4cEo/ynwR1Dbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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