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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55201a8bfb38de89286b580678d84989946cdae981cdabd1ae41b80c01bd8dc2' 
  AND token = '7MT3Gz0rFC9acjIssnQk5+RlfSpx5qxq742PzXhrcGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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