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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb2da92d8ddfb4e0584d6be73c3323c7b643d7c1ec901e91f906bc8c60667fd' 
  AND token = 'R93JMNKiXuqRgV5jiFh8iWGp8O4xL7Tw/aV7UnAZ2W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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