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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f567efc107b5953b3f8040c0e5e279736909e2ede70b7dac52690ad47d6f1d4d' 
  AND token = 'oZY0ktuzB/5F7K7r6za/jupMYjBTNiM2PGhSqIemIsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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