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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791562492c5e13a578d0e0e387d281815725ee58215756bf0b523e1e00b99820' 
  AND token = 'uAcJeAdvKhPpnm1XE/lFL9qy5yqxnADxCwUdyDFxJLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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