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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270ae8932f6ec14a688e5c529637e240c9d6bdc53d8e2ed872201af457aa07e0' 
  AND token = '8dQ+hsg7l88jTu4rjlmPN+u6Rpc+7ltt2GX4eoILu/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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