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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b255a872bda8bfa04c86e946378b9ec2297ea660bad0417de213274d1dafc3f3' 
  AND token = 'Nwv4UUpW34wWUql0saoZY0t8JK9n2H4U8tCZymVbMuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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