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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b70a01f69e9a02c525e1f9119f11d9367cc5c35e5f5ff13c234b4c7eeff602' 
  AND token = 'iO9HaZcT8NqyI77w5l0ONdigiSiwTLl9yalDfxj3Ze4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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