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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fffab7dfb7b3151ba358ba9422befa2c2dd56cc04a93a5eb8e86d711d92d7b' 
  AND token = 'Eedravbmjd+WYz+h4nX3+PGAC+SItDz+Hk/QFFLxaUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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