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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a438ef50fd6f90b37e1fcdaee2232501478cd5e8f07292a30144f4f393d63ef' 
  AND token = 'ihsAWPD664lFqEniWmy/ox2RPraWbXYuXKRC2Q5TG6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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