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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebab26a19b5efadd91d49865423b4642d5b6e59ea87596a0c6febb352a10d37a' 
  AND token = 'axxbRxpY9Y6gxQ4IOuXUeN+as5Kn/cJnieXbYzOWQXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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