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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7bed5de6c7093ee0c6f06427e0bb9ee9de29e26390b823df5fd084114a3cf9' 
  AND token = 'e2WSgvajuJ7IRvQOb5VgPxZWBtRZsUoynz00NbBckTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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