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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f223e5a77c4bb9b9db893de25b6d4be9e3ba83b0f79e8f6decb1512fedd85808' 
  AND token = 'UrwyB/HU4G/QwgWS1LLCQbLgtveb2OIn2/XmTgmHya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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