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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb74a980c499e41b1b1840b1ca803d3bdcdcc21f84d26cd8853f4d6e72d1077' 
  AND token = 'xxr9e3/vahkVUESPnS6yXVWTHsU2wtcelElaBYMcJtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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