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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70e4e5766efc64c5ea681ed8715d227d21635efef3bbe40061fc2913e1dd058' 
  AND token = 'eBY+V9W+uYt6Wu7rmc1m11d4yB070CVs1SMgufJHezQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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