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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45af0f43307a00f0bef81b5772b465ae8ab59fd9449eb0cbbb3f093f88e98019' 
  AND token = 'dfhuoPPncm50XXqe2sZe7LjX/f0gtJdtI+bi0grzTks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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