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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7532716570f898e4dc2055f89d1d12142b5a0418987d8c8a123c8a991727c6e0' 
  AND token = 'KVantNbTSW2F5hWjRbHiLS7brpWQdC7uvP6sP6vFAho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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