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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9882c7653b57de1bbe4653e4b1764fd9315b22ece1f8362ce32fb7891ae523ca' 
  AND token = 'WEig+YrsOkzK79tynj16LtkEMpkurZo1+H/JKydTEv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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