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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c672b62ebe1ecb4eefc349c2443557a628a42eac6c16cbcbffa476f61d26b642' 
  AND token = 'wrNFpF0F4OW1vUJABfy+jFz4dr2VJVU1+u8h89klJZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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