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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9a2ccb2d2ef673852fac98d8cab7c2654bd27ff733ec0280eb312f7e68e5a9' 
  AND token = 'PzbCCeYO+6ucansM2NlbgkpVSVqvsCw2gBGg9oA36xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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