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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf1da3c736210464177dc53eeffa36b1feaefab03de344ee296cf0ae92e3c1c' 
  AND token = 'XxURN9Gf7la5TeSWG3bxQvKd+4kBM1e4o+ukBwzj+No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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