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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87132ffdd79db8a682e77309a0557a3270cd3ef38901abccc2d3e9db4999c215' 
  AND token = 'pHKX94uVg/wOnczhMP0E4TlUm9mpEhkQ9AQZiyz8USI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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