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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbcafa23d6153dc61f7bb1eac607d38eff07ca9f9b70d3544ccef20b97b16eb' 
  AND token = '30pZ/Bby+X/bpu5h+UyGeOFIk8t2x3FeXvL1YmEMO0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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