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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd1d9bac4992ecd101bbd8a4cdfc4a7e6958ffce2c21a22e18ffc8a60704c1b' 
  AND token = 'DvOaq9bHsL8T2FF5vAvOAw5gCkvuXm1IlFmdz+WU2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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