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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd237bd6a15c034285c49d500cc13891101a0e77d43f03b9304417a17956bef66' 
  AND token = 'L6EiPx0wSP6GbeUQsutzvM/7szevmnb/5Gt/wyZeLqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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