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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc50d1a3062f14d8c828dda0b3eee17a200e0af1df1046b1e25c83633b4878b' 
  AND token = 'MJ7+cpMaXAVzpdykFk1phsyAiWGb7ChcQQ1wCN5sjwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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