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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6bbe19ab0560803eb9cd75676b982eb217f8d5797bcaa96a9cf1866b6a519b' 
  AND token = 'CeKMq5nIgxXrawEmE8sbWklN3Mhl/zA3yxGE7Xf2aO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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