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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1326e5d8751ea5ee403caaf760ca0353a73caee7ecf80da9ab716b47f580fb79' 
  AND token = 'hSQrAmThF+botpCXD4dhAsJzZ8hy37agE+hEJH3HZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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