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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c9ae9223e73493cd4773886b34fd4a20e0464db3674b8a93682f65316e83d6' 
  AND token = '2EFnrGZMWY2+UQWmW1/SMXk4rRid6yG+MEsu707QRak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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