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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e15e7359c02f468a3a6a561c532ef25dd6f5f22572543ba49ceb98b0631862f' 
  AND token = 'nF2UACrTm4VqUYIbo/och0IEn/kH7XP1wx13cdKVibg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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