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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807636a8612cc43aeac3a83d75d415f14c6c062c32fe938a3bd1d848874758fd' 
  AND token = 'rDFj3pTHUdL2WEROi7a539a6vEW7ofq/7khv2qukiAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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