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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fcf14d65c9736087b70093c1d247375c9a99bbcba7f882042bc0b9b9ae05dc' 
  AND token = '1bI2Zsu40zOZgb8cLi7dRtnAHO57t4Uup/3ush0S4sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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