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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b84a1cb4316a4f1513fae8101bba22416e0d5b5a5ab2687d87b35feaaa3906d' 
  AND token = 'yUESeZc7f++1vyx0xjmps66BxemTQ9rneHDuELEcZh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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