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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4212b90774190efafa55c96f8f8036dee7a2d522d4120373bd4036fda120ecd5' 
  AND token = 'UyvcvPeL5hPPj/MyX5tW5aECdh9QtG1Vl9ueIoyrLts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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