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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa8a6fe308a2bae26a38c6792e98375e2dc25a9f005f32ae39adbaf210ce6fc' 
  AND token = 'KAIMBVaKDjiDIfgHv+epc/OWQJ1U3pKrB1EOQVY657s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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