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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ad559cf386f9cf4b4c2bd41b99067d60085fe8a7be6bcff6d0191fbbfb573d' 
  AND token = 'AH25tlE0Eix+KLOwpmF7ypNUHJE9YVQTXC736+tSxCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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