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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ad51be5391f77d27628552ca1faa3126b74930d0dfb7714e6946dd3af6b98f' 
  AND token = 'N7Gnhjtx1o6TaC5fmWOphDODNsxu78/iY69fMeTPoj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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