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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53ad8694f13c4f24c2a90ffdfcb1a078557747d6cf82a85b593b938f3959a80' 
  AND token = 'jscpi84QsfbsyIbI8nXr6OLztG69ve6utU+5m7k6He8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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