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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84c9541f111a0f21ad42b58824aba3fa7efbfc3e1d0b2f388ded99c3d6f861f' 
  AND token = 'esZBTMFM6dFk8DGNleoLAauK75USuLwyhehEyrxE3Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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