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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f771aef1988c4e45cd519b91ce521894a6bfd467c2e3855ca08c3d7e543dac' 
  AND token = 'F89V/xJeqS+5NLebuyjSeE+WYCUjM+X4S3Bh+/WKRts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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