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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02338ecd794076527d948aaa85be790b614ff10db392f3f572fad34c2f5327d' 
  AND token = '7iIqWqUPz2hg0G7r+4TLrw+jjobh0EOQz9y+thI7Y4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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