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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bcc36ba9ea7b3bb77e4a77879d67a9d8e57c4a4c2508d3a5c7d7d279066abc' 
  AND token = 'Slal6aLIrC8nxKdrj8njF0c+cFdU4NPCAEQn99szS7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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