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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056faa2d8414f1797e79226bf89baf49b25c8779c6d0db1025e0a27e188e5e7f' 
  AND token = 'Oly4urUAkRp7dqGRjEldZth5iaL8V6b8yMB/yNAO7hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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