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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f1ed2c2d82ed4d2fa9a19ae92f9fcf3d2b91d2e45e214b9f035b3d7c7809e4' 
  AND token = '67Wv2VsXYlBc08lmjy7XIQ2o5pg2R1yF1pyfNeaZi9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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