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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a14899f00037b8c050ef9f4e3f40253c53bb30872571a8c90bfcfb16579a43e' 
  AND token = 'fv7cetmAfpzcMtAC5szkDqJR03Xp+vWrtpeA2p6iyf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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