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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb68e9a800912f31750deefa1da5dc4d0daa1503c828a7439a018a030bc7fe7d' 
  AND token = '79UZ330xFp6SKGQdxpaIo5C/BJCU0mSV7c6hN84Ub9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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