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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab50218942b538d8e81d3c8f42ef402da5d9d8e90d018b13faa31cb8ee9e0247' 
  AND token = 'SZmoKLehhZMp47TXZ6FivU3P+VxMihUMqF191r9paQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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